William campbell



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gleiten tatr @anni @ffice .WILLIAM CAMPBELL, OFv NEW YORK, N'. Y LettersPatent vNro. 69,176, dated Srjtemer 24, 1867.

IMPROVED WINDOW-SHADE FIXTURE.

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TO ALL WI-IOM IT MAY CONCERN:

Be it known that I, WLLIAM CAMPBELL, ofthe city, county, and State ofNew York, have invented a new and useful Improvement in Window-ShadeFixtures; and I do hereby declare that the following is a full, clear,and exact description of the same, which willeuahle others skilled inthe art to make and use my invention, reference being had to theaccompanying drawings, which form part of this specification, in which-Figure l is a front view of my improved window-shade, part being brokenaway to show the construction.

Figure 2 is a detail sectional view of thc same taken through the line:i: fr, fig. 1. v

My invention has for its object to furnish an improved device, by meansof which the spring-roller of a wii'idow-shade may he made to hold theshade stationary at any desired elevation, and yet allow the shade to hedrawn down or run up, without obstruction or stoppage, as far as may bedesired, and it consists in the combination .of the loose or sliding`pins or bolts, havingheads formed upon them, with the flattened shaft ofthe roller, as hereinafter more fully described.

A is the windo\.shade. B is the hollow roller, one end of which ispivoted to the bracket C, and thevother end of which revolves upon theshaft D, that carries the coiled spring, and the projecting end of whichis secured in the jaws of the bracket E, so that by drawing down theshade A, and thus revolving the roller D, the coiled spring may 'hewound closer around the shaft D. In the block or part of the roller Bthat closes or forms the end of the said hollow roller B, and forms itshearing upon the shaft D, are forined two holes, leading, upon opposite`sides, from its outer or convex /snrface to a little at one side of itscentre, as shown in fig. 2. The outer ends of these holes arecountersnnk, as shown. lhe two opposite sides of the shaft D within theblock er part 5 are flattened or notched, as shown in fig. F are twopins or belts, the bodies of which lit into the holes in the block Z1,and their heads lit into the eountersunk parts of said holes. 'lhe boltsor pins F are of such a. length that when their heads rest against thecase or shell of the roller B their points may be free frein the shaftD, and when their heads rest upon the hottoin of the countersnnk part ofthe said holes, their inner ends or points may overlap the flattenedsides of the shaft D, so as to hind said shaft and prevent itsrevolution. Whenever the shaft D is drawn down or allowed to run up withav little rapidity, the centrifugal force engendered by the revolutionof the roller B projects the pins F outward, so that their heads restagainst the case or shell ofthe roller leaving the bleek b free terevolve upon vthe shaft D. But when the motion ofthe roller D ischeeked, the pin F that happens to be uppermost drops down, so that itspoint or forward end rests upon the shaft D, and as soon as the saidpeint reaches the flattened side of said shaft it drops down a littlefurther, so as to overlap the said iattened side of the said shaft andhold it securely in place.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent- 1I he combination of the loose or sliding pins orbolts F, having heads formed upon them, with the flattened or notchedshaft D, substantially as herein shown and described, and for thepurpose set forth.

The above specification of my invention signed by me this 14th day ofAugust, 1867.

WM. CAMPBELL. Witn esses:

WM. F. McNAMAlA, JAMES T. GRAHAM.

